// ListNode.cs
//
// Copyright (c) 2009 Jérémie Laval and Sylvain Marchand
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//

using System;
using System.Linq;
using System.Collections.Generic;

using Irony.Compiler;
using Irony.Compiler.AST;

using Microsoft.Linq;
using Microsoft.Linq.Expressions;

namespace Bechamel
{
	
	
	public class ListNode : BechamelNode
	{
		DatumListNode elements;
		
		public ListNode(NodeArgs args, DatumListNode elements)
			: base (args)
		{
			this.elements = elements;
		}

		public override Expression GenerateExpression (ETGenerator generator)
		{
			IEnumerable<Expression> expressions = 
				elements.ChildNodes.Select(o => generator.GetExpressionFromAst(o));

			return Expression.Constant(MakeList(expressions));
		}

		Pair MakeList(IEnumerable<Expression> exprs)
		{
			Pair initial = new Pair(null, null, true);
			Pair current = initial;

			Expression[] childs = exprs.ToArray();

			int i = 0;
			for (; i < childs.Length - 1; i++) {
				Pair temp = current;
				temp.Car = childs[i];
				current = new Pair(null, null, true);
				temp.Cdr = current;
			}
			current.Car = childs[i];
			current.Cdr = Pair.EmptyList;
			
			return initial;
		}
	}
}
